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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291497b819d0a72cb3a7bcbc6983c142c54efd9d41f37df290792cbb98bf497b' 
  AND token = 'sQla3REID6MFEkikl1dEsa5mR2687LxR1TtieDHhWtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}